Microwave oven



FIG. 1 is a perspective view of a microwave oven of the present invention;

FIG. 2 is a front view thereof;

FIG. 3 is a top view thereof;

FIG. 4 is a bottom view thereof;

FIG. 5 is a left side view thereof; and,

FIG. 6 is a right side view thereof.

The broken lines show parts of the microwave oven that represent unclaimed subject matter and form no part of the claimed design. 

CLAIM The ornamental design for a microwave oven, as shown and described. 